Reeling from Des' change in plea, Jay and the police throw themselves into proving premeditation. If they can show the court that Des was undoubtedly of sound mind when he committed his crimes, he will go down and never be released.
The series will tell the story of the arrest and trial of serial hugger Dennis Nilsen, known as Des, through the prism of three different men - Nilsen himself, Detective Chief Inspector Peter Jay, and biographer Brian Masters.